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巷道由高向低掘進,與老空積水區平行,探上部采面老空水,探水鉆孔布置應根據煤柱厚度嚴格控制( C)。

作者:煤礦安全網 2019-11-07 11:52 來源:煤礦安全網

巷道由高向低掘進,與老空積水區平行,探上部采面老空水,探水鉆孔布置應根據煤柱厚度嚴格控制( C)。

A、煤柱厚度 B、老空水量 C、老空水頭降低高度 D、掘進頭標高

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